Apparatus for automatically adjusting the sparking period of ignition systems.



A DIBMER. APPARATUS FOR AUTOMATICALLY ADJUSTING THE SPARKING PERIOD OFIGNITION SYSTEM APPLIOATKOR IILBD MAR: 10, 1913 Patented Aug. 4, 1914,

2 SHEETS 'SHEEE P M l E w /v N WITNESS ES Ln/SMW UNITED sTAfrEs PATENTOFFICE.

AINTON DIEMER, 0F STUTTGABT, GERMANY, ASSIGNOR TO THE FIRM OF ROBERTBOSCH, OF STU'ITGART, GERMANY.

AxPABATU-S FOR AUTOMATICALLY ADJUSTING THE SPARKING PERIOD 0! IGNITIGNSYSTEMS.

To all whom it may concern Be it known that I. Amma- Dirmzn, a subjectof the Emperor of Germany, resuling at and whose mst-oliice address 15Lerchenstrasse 71', Stuttgart, Germany, have invented certain new anduseful Improvements in Apparatus for Automatically Adjusting theSparking Period of Ignition Systems: and I do hereby declare thefollowing to be a full, clear, and exact description of the invention,such as will enable others skilled in the art to which it appertains toma-kc and use the same.

The present invention relates to electrical ignition apparatus andparticularly to apparat as for automatically varying the an gmlarrelation betwen the driving and driven elements in accordance with thespeed of an associated internal combustim engine in order toautomatically vary the sparking period of the 'wdtion, system relativelyto the stroke of the engine; For this purpose the rotatable driving anddriven elements are displmed angularly relatively to each other indirect opposition to circumferentia'lly disposed springs. imd thisangular displacement is brought about by radially mov mblx: memberssubjected to centrifugal action and arranged in such manner that theymay cooperate to totalize their individualorigin lair displacements, orthe amounts of their separating force, on both.

In the preferred embodiment within my invention. the driving and drivenelements are each, symmetrically arranged relatively. to the axis ofrotation. and each is provided 1 with bearing surfaces which advancecircnmfierentia-lly with: increasing raidiail disof the odjjacentelements, but inthe opposite direction thereto, so that the radiallymovu-blemembers acting between the adjacent bearing surfaces graduallyadvance the driven member mlivtively to the driving member 1 through an"accumulative Migulm" M at and by an. accumulative i Specification ofLetters Patent.

Application filed March 10, 1,913.

Patented Aug. 4, 1914.

Serial in. 753,211.

separating force as the centrifugal action increases inresponse to anincrease in'the engine speed. The pressure springs are 011-cumferentially disposed so as to (linrtly oping torque of a magneto,-for example, such,

fluctuations usually. occurring most at low speed vms a result of thevariable natune of the mzigrneti-e attraction between the fieldinanigets andthe shuttle armature thereof. Preferably. these springs arearranged symmetrically. zinxil not in a circumferential directiondirectly between the driving and driven elements. In this way, therotating parts of the adjusting apparatus are symmetrirally disposedabout the axis of rotation, and are therefore mechanically balanced atall positions, so that the uniform operation is not disturbed thereby atany time;

The apparatus of my invention may be installed in variou places im onelectrical ignition system, as between the. enginennd the ignitionmehine to simultaneously vwry the angular position of the machine-11mlthe associated mechanical interrupter relatively to the stroke of theengine, or it may be locntecl between the ignition machine and themechanical imterrnpter to angtularly displace the interrupterindependently of the ma chine. i

in the accompanying drawings, illustrating this preferred embodiment ofmy invention and several modifications thereofi in application to amagneto as an: example,

resents a section similar to Fig. 1 of a.

and driven elements; Fig/4; represents an the cylinders of which thecombustible mix-' tures are ignited in proper order by sparks.

produced at spark plugs therein by ignition voltages generated in therotating armature t of the magnetd in the well known way. The drivingmember a is loosely mounted on the end of the armature shaft 11 and isprovided with driving elements I) which are 1 symmetrically-disposedrelatively to the axis of rotation, there spaced approxima ly 180 apartin Figs. 1, 2, 4, 5 and 6, and three of such'elements spacedapproximately 120 apart in Fig. 3. In all the modifications the bearingsurfaces b of these elements advance circumferentially in the samedirection with increasing radial distance from the axis of rotation, andpreferably have the form of a concave wedge surface as shown. The drivenmemher a, likewise in the form of a disk, is fastened on the shaft d ata suflicient axial distance from the disk 0: to clear the drivingelements 6, and it is provided with the symmetrically-disposed drivenelements 0 equal in number in each case to the number of drivingelements I), but having their hearing surfaces circumferentiallyadvanced in the opposite direction thereto. The ad jacent driving anddriven elements are held apart by the circumferentially arrangedpressuresprings i which set in the recesses h in the elements on thefaces m away from their bearing surfaces.

In the modifications shown in Figs. 1, 2 and 3, a roller 9 is interposedbetween the cooperative bearing surfaces 1) and c of each pair 01driving and driven elements, so that when the shaft 8 is driven by theengine the rollers 9 move radially outward between the bearing surfacesin response to centrifugal action, and thereby advance the driven member8 relatively to the driving mem er 0 against the pressure of the springsi in accordance with the speed of the engine.

In these cases the displacing force effective on the driven member isaccumulative, while the angle through which the driven member isdisplaced relatively to the driving memher is twice the effectivecircun'iferontial advance of each bearing surface.

In the modification shown in Figs. 4 and 5. a symmetrical intermediatemeiigber f is loosely supported for free rotation on the shaft (1 and isprovided with oppositely directed bearing surfaces f on each side of theshaft and of substantially similar shape as the cooperative bearingsurfacesb and c of the driving :m .l driven elements. After a bang twoof such elements certain speed of theengine is exceeded, the rollers 9move radially outward and accumulatively advance the angular position ofthe driven member relatively to the driving member. Thus if theeffective circum ferential advance of each bearing surface 7), c and fis five degrees, then the total angular advance 'of the driven member erelatively to the driving member (L is 20. Furthermore, the forceseparating the driving and driven members is twice that produced b eachroller. Upon reduction of speed 0 the engine the same results occur inthe opposite direction.

There are two intermediate members f shown in Figs. 6 and 7 and sixrollers g are employed between the cooperative bearing surfaces 1), cand f, so that an elfective eircumferentialadvance of 5 of each bearingsurface produces a total displacement of 30 of the driven memberrelatively to the driving member, while the force of angulardisplacement is twice that effected by each roller. The intermediatemembers fif are symmetrically disposed so as to e ect a mechanicalbalance in all positions of rotation, and the members f are constructed,as shown in Fig. 7, in such manner that their bearing surfaces lie insubstantially the same plane. The rollers 9 herein shown, and also theintermediate members f, when such members are employed, are maintainedby the springsi in constant engagement with the driven elements as'wellas with the drivins elements, even when the driving torque required bythe magneto armature varies considerably throughout each rotation,thereby reducing chattering and wear of the parts. However, the wearwhich does result after continued operation has but little influence onthe positiveness of connection between the driving and driven members inthe arrangements shown. The circumferential arrangement of the springs 5shown in the drawings permits the use of simple pressure springs:between the driving and driven elements so that they act directly inopposition to the angular advance of the driven member.

Having thus described my invention, what I claim is 1. In apparatus forautomatically adjusting the sparking period of an ignition systemrelatively to the stroke of an interual combustion engine associatedtherewith, a rotatable driving element having a bearing surface, arotatable driven element having a bearing surface, a displacing memberadapted to move radially outward between lhe bearing surfaces inresponse to centrifugal action and thereby exert a circumferentialdisplacing force to vary the angular relation between the driving anddriven elements, and a circumferentiallydisposed spring adapted todirectly oppose ii Li w-igmqwa iii the npcuil of (he: tllgillfl andcircuinfcren' lZlZ'Kll VTllb'pUSSQi oppogc mill in Elks ilcscriha-il.

li; a lowance for miiorniiticzilly adjusting lhv qmiliing period m" anignition syszciil i-rhuimly in all: elrokc of 311'! internal (UlliHltnlv il i; igizw iicsociziiml l'uncwith, a

' 5 c vnw ii having frmmctii lawn-lug; rdirfziwsfli |(ll2l2!l l onezllzlilili! inning; nin'icu'icaily dis- 7 rl binning! surllmo v'phv'ingmcmhcrs :nlzi mczl Lu mow mil: m outward hctweon ilizc hm: m" an? inch,in riwponsc to centrifu- LJii Hllllull Will {i wily "gm-'5 a rjycumfgreyy l iiiagllzningg to vary the angular wings ailzintml todirectly glaring force; whstantmlly Iii;

h cxw t Pin-uni: 5+- 1 in wiry th angular rcdriving: and (lriwcn cicn cwith. the HPKLll of lhe f i nll siirizngcll circum- :g r nqs 'uzi itcclho fly szaiil ng 111cm arrl hecenirifngal action. and thereby exert acircumiereiitial displacing force to vary the angular relation betweenthe drivin and (lurch elements SPWE-ll of the engine, and circumfcrentiallydioposcrl springs adapted to directly oppose willdisplacing: force: substantially as described.

6.. lnvapparatus for automatically adjusting the sparking period of anignition sys- Lcni rclaliively to the stroke of an internal combustionengine associated therewith a rotatable driving; clement. liavvinbearing surfaces which advance circuni'ercntially with increasing radialdistance from the axis of rotation, E1 roczitable driven clement havingbearing surfaces which advance in the opposite circumfcrontial directionwith increasing radial distance "from Lhc axis of roration displacingmembers adapted to more radially outward between the hearing surfa es inrccponsc to ccnn'ifugal action and thcrchy cxcrt a circunifcrcntiiildisplacing force to vary the :ii'iguhir relation between :lm drivinglillll ilrix'cn elements in accordivcn cle-incni f once with thc spccilof tho engine, and circnmfcrcntially-dihposcil aprings adapted toilircctly opgmsc .iil displacing force; substantially as icHr-i'ihcll.

T. ln appamins for autonmticnlly adjustng: the ni,1-li'ing pcriml of anignition sy, tcn: rclniircl i to the slroiic of an internal :onilmi-tioncnginc HSSUUllltfill thcrowith; a rotatable dri ing clcmcnii havingSYIIHIlQtIh vullvilispom-ll hcilring hurfaccs which advziiacrcivic-uml'vrcniizilly ilh incrcasing radial ilis'mn iiron: lilo axis ofrotation. a 'l' l i lliblf ilrivm clement liming bearing sur aces dispacing niumhcz adapted lo more riuliiilly mix-mid nciwccn tho hearing:wirfiucs in llwpl li l t conrri'lugal action izl thcrclrv or;

by Liv: angular rclution hoig; and ili'iu-ii clcmcnts in [ho spew} ofill: engine, ir iim enlinlly-llispi ml springs ll(l li' l{-'l so rlvrclly oppow said lisp-lacing l'or c: zluliqu-iiilinll v 11sllkTSPlllJli'l.

8. ln zippzii-zzlm l'u' aiilcn'iulically adjust in thc awn-king }?(fl'l?(l of rm ignition sysloin relatively. to the strokv :in inlicrnulmmhmliml cngziiic usswiutml lhcrvwiih, a r: l2ll2ll l( hiring clcnicm Mnlily; I-- \llllllLlT'l- (w fl h 51ml l/cziring r; 'l l Ph which 2l(luil'wnlinlly with invrcwing i wlilllia' lye-in he axis of rulull-Qll, :1

liil with incrcusing radial (l @mrc from axis of rotation. ilisplziciiigmomhcrs mi to mow radially out mm between Lcnring surfaces in resy'ionseto centrifz-w sn and thereby cxcrl'a circumfercinnii displacing force tovary the angular in acci'irdancc willn the vance 9. I apparatus forautomatically adjust mg the sparking period of an ignition systemrelatively to the stroke of an internal combustion engine associatedtherewith, a rotatable driving element having symmetrically-disposedbearing surfaces which adcircumferentially with increasing radialdistance from the axis of rotation. a rotatable driven element havingsymmetri callydisposed bearing surfaces which ad vance in the oppositecircumferential dime tion with increasing radial distance from the axisof rotation. displacing members adapted to move radially outward betweenthe bearing surfaces in response to centrit' i ugal action and therebyexert a circumferential displacing force to vary the angular relationbetween the (lrivin and driven elements in accordance with t e speed ofthe engine, and circumferentially-disposed springs between the elementsto directly oppose said displacing force; substantially' as described.

10. [n apparatus for automatically adjusting the sparking: period of anignition system relatively to the stroke of an internal combustionengine associated therewith. a

rotatable driving clcment having a bra ing surface. a rotatable drivenelement having a bearing surface. a rotatable intermediate member havingbearing surfaces cooperative with the bearing surfaces of the driving.and driven elements. displacing members adapted to move radially outwardbetween l'ltc bearing surfaces in response to centrifugal action andthereby exert a circumferential displacing force to vary the angularrelation between the driving and driven elements. and acirciimferentiallydisposed spring adapted to directly oppose said displaing force: sul'istantially as described.

11. in apparatus for automatically adjusting, the sparking: period of anignition system relatively to the stroke of an int rnal combustionengine associated therewith. a

rotatable driving element having syiutnetricallv-disposed bearing surfaes. a rotatable driven element having synnnctri allv--disposed bearingsurfaces. :1 rotatalilc intc mediate member havingsymmetricallv-disposed bearing surfaces cooperative with the bearingsurtnces if the driving and driven elements. displa ing members adaptedto move radially outward between the cooperative bearing surfaces inresponse (I centrifuga action and thereby exert a circ int'cr entialdisplacing force to vary the angular relation between the driving anddriven elements in accordance with the speed of the engine, andcircumfercntially-disposed springs adapted to directly oppose said displacin force; substantial y as described.

152., n apparatus for automatically justing the sparking periodpf anignition system relatively to the stroke of an internal combustionengine associated thevewiiln a rotatable drivin element having amulet--ricall vdisposed earin J surfaces which ad vance. circumferential y withincreasing radial distance from the axis of rotation, a rotatable drivenelement having symmetrically-disposed bearin surfaces which advancecircumferentialy in. the opposite direction with increasing radialdistance from the axis of rotation, a rotatable intermediate memberhavin symmetrically disposed bean ing surfaces w ich advance circin'n.ientially with increasing radial distance from the axis of rotation andin a direction opposite to that of the adjacent bearing surfaces of thedriving and driven elements. displacing members adapted to move radiallyoutvvard betw en the cooperative bearing surfaces in response t centrifual action and thereby exert a v;HHITlfQYQIlURl displacing force to varythe angular relation between the driv Eng and driven element inaccordance with the speed of the engine. and cir unifereirtinny-disposed springs adapted to directly oppose said displacing force;substantially as described.

ll. In apparatus for aulmiiatically adjusting the sparking period of anigni system relatively to the stroke of an into ecinbustion engine asociated therevvith. a rotatable driving element having bearing surfaces.a rotatable driven element hm ing a-aring surface a plurality ofrotatable inermediate mei'nl'icrs having bearing surfaces cooperativewith the b aring surfaces 1 f the driving and driven clcnicnts.displacing members adapted to naive radially outward between the bearingsurfaces in respon e to centrifugal action and thereby exert acircunitcrcntiai dr pla "iii; force to vary the angular l' iolit iibctwccn the ill ldlfi and driven vhnwulsl in accordance With t speed ofthe engine. and cilcuuil'rrciiliallyn iosctl prin'zs adapted to dire tlyoppose HlHl dis placing 'l HI QI sulntantiaily as des ribed.

l}. in apparatu for automatically adusting the ririving period of anignition ystcni rclatiwly to the stroke of an internal conibustii'ntengine associated ilicrwvith. a rotatable. driving element liavinsyniuictri call v-dispo iwlbearing surfaces which advan ecircunitercntially with in reasing radial di tance from the axis ofrotation. a rotatable driven element having symmetrirally-disposedbearing surfaces which advance circumferentially with increasing radialdistance from the axis of rotation, a plurality of intermediate meniiershaving symnietrically-disposed bearing surfaces which advancecircumferentially with increasing radial distance from the axis ofrosprings interposed between the driving and tation and in the oppositedirection to that driven elements to directly oppose said dis:- of theadjacent bearing surface, displacing placing furce; substantially asdescribed members adapted to move radially outward ln testimony whereofI aflix my signature, 5 between the bearing surfaces in response to inpresence of two witnesses.

eentrifu al action and thereby exert a rir v T 1 eumfereiitialdisplacing force to vary the ANTOI DIEMLR' angular relation between thedriving and \Vitnesses: driven elements in accordance with the speedPAH, Won-Aer 10 of the engine,and clrcunlferenthilly-(lisp!med HnnnimxSmixrimrx'

